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Question
An acidic solution of hydrogen peroxide behaves as an oxidising as well as reducing agent. Illustrate it with the help of a chemical equation.
Solution
(i) Oxidising action in acidic medium:
\[\ce{2Fe^{2+} (aq) + 2H+ (aq) + H2O2 (aq) -> 2Fe^{3+} (aq) + 2H2O (l)}\]
\[\ce{PbS (s) + 4H2O2 (aq) -> PbSO4 (s) + 4H2O (l)}\]
(ii) Reducing action in acidic medium:
\[\ce{2MnO^{-}4 + 6H^{+} + 5H2O2 -> 2Mn^{2+} + 8H2O + 5O2}\]
\[\ce{HOCl + H2O2 -> H3O^{+} + Cl- + H2O}\]
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